The Trane SS2 (SWT04524, 21Q3JH) Shut-Off/Safe-T-Switch is a condensate drain safety device designed to help prevent water damage from HVAC system clogs. This switch is equipped with a 3/4" adapter for easy inline installation and is ideal for residential and commercial air conditioning systems. It automatically interrupts system operation when condensate drain issues are detected. Key Features Prevents water overflow by shutting off the system if the drain line becomes clogged 3/4" adapter included for fast and easy installation Reliable float mechanism for accurate water level detection Helps comply with building codes and protects against costly damage Works with most air handler or evaporator coil units Specifications Part Numbers: SS2, SWT04524, 21Q3JH Type: Condensate Drain Shut-Off Switch Connection Size: 3/4" male pipe adapter Switch Type: Float-activated safety shutoff Voltage Rating: Low-voltage (typically 24V systems) Mounting: Horizontal or vertical condensate line Compatible Models (Short List) Designed for use in a wide range of Trane and American Standard air handlers Common in models such as: TEM4A0B36S41SAA, GAM5A0B30M21SAA, GAM5A0C60M41SAA, TAM7A0C60H51SAA, TEM6A0C48H41SAA Why Choose This Item Don?t let a clogged drain pan ruin your system. This Trane Safe-T-Switch gives you peace of mind by automatically halting operation before leaks occur. It?s a quick and affordable way to protect your property, ensure HVAC safety compliance, and reduce costly repairs.